Patent US3250913A successfully refreshed from Google Patents.
US3250913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminaire
Assignee: Holophane Corp
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Filing: 1963-09-17
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Granted: 1966-05-10
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Expires: 1983-09-17
Abstract
No abstract record available.
Inventors
- 👤 Dale E Welty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:51
CPC Classifications
F; F21; F21V; F21V5/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
74 words
A REFRACTOR COMPRISING MEANS FOR RECEIVING AND TRANSMITTING A MAIN BEAM OF REFLECTED LIGHT GENERALLY CENTRALLY OF THE REFRACTOR ALONG AN EXTENDED CENTER LINE AND FOR SIMULTANEOUSLY RECEIVING AND REFRACTING A CONE OF REFLECTED LIGHT EXTENDING SUBSTANTIALLY ALONG THE CENTER LINE OF THE MAIN BEAM AND AROUND THE MAIN BEAM, SAID MEANS INCLUDING A PLURALITY OF SECTIONS OF LIGHT TRANSMITTING ELEMENTS, SAID SECTIONS INCLUDING A CENTERMOST SECTION, SAID ELEMENTS OF WHICH CENTERMOST SECTION IN-
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |